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Related Concept Videos

Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Mechano-Electrochemically Promoting Lithium Atom Diffusion and Relieving Accumulative Stress for Deep-Cycling Lithium

Dehua Xu1, Nian Zhou2, Aoxuan Wang1

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

Advanced Materials (Deerfield Beach, Fla.)
|May 19, 2023
PubMed
Summary

Researchers developed an elastic lithium metal anode (ELMA) that uses tensile stress to enable smooth lithium deposition, significantly improving lithium metal battery (LMB) lifespan and stability for high-energy applications.

Keywords:
elastic lithium metal anodehigh energy densitytensile stressvolume expansion

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Mechanical Engineering

Background:

  • Lithium metal batteries (LMBs) offer higher energy density than lithium-ion batteries but suffer from lithium dendrite growth and volume changes during deep cycling.
  • These issues limit the cycle life and safety of LMBs, hindering their practical application.

Purpose of the Study:

  • To investigate the effect of tensile stress on lithium deposition and develop a stable lithium metal anode.
  • To enhance the cycling performance and longevity of lithium metal batteries.

Main Methods:

  • Developed an in-situ mechanical-electrochemical coupling system to study lithium deposition under stress.
  • Utilized Density Functional Theory (DFT) and Finite Element Method (FEM) simulations to understand lithium atom diffusion.
  • Engineered an elastic lithium metal anode (ELMA) with a copolymer layer and a 3D elastic conductive polyurethane (CPU) host.

Main Results:

  • Tensile stress was found to induce smooth lithium deposition by reducing the energy barrier for lithium atom diffusion.
  • The designed ELMA demonstrated stability over hundreds of compression-release cycles under 10% strain.
  • LMBs with ELMA achieved over 250 cycles with 80% capacity retention under practical conditions, exhibiting five times the lifetime of conventional lithium foils.

Conclusions:

  • Incorporating tensile stress into lithium metal anodes is an effective strategy to suppress dendrite formation and volume expansion.
  • The developed ELMA, utilizing a copolymer-lithium bilayer on a CPU host, significantly enhances the cycle life and stability of lithium metal batteries.
  • This approach offers a promising pathway for realizing high-performance and long-lasting lithium metal batteries.